Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session F08: Two-dimensional Topological Insulators: Transport (II)
11:15 AM–2:15 PM,
Tuesday, March 6, 2018
LACC Room: 153C
Sponsoring Unit: DCMP
Abstract: F08.00012 : Noise-induced Backscattering in a Helical Quantum-spin-Hall Edge
1:27 PM–1:39 PM
In a 2D topological-insulator edge scalar potential disorder does not induce elastic electron backscattering, implying a quantized zero-temperature conductance. At finite temperature, electron-electron interactions generate inelastic backscattering, though the resulting conductance modification vanishes as a large power of temperature due to small scattering phase-space volume. We study a novel mechanism for conductance suppression: backscattering caused by electromagnetic noise. Noise leads to disorder potentials that fluctuate randomly in time, and can backscatter electrons inelastically without constraints faced by electron-electron interactions. We quantify the noise-induced correction to the time-averaged linear conductance under a variety of possible regimes.
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